Tandy 102 Service Manual page 51

7. Memory protection doesn't function
7
Check the power supply voltage.
• When power is ON: VB =+5V (if not, check converter circuit)
• When power is OFF: VB = 2.0 - 4.OV (if not, check Ni-Cad battery, D11 and D22)
Check to be sure that there is no deviation in the timing of the signal and that the
level changes symmetrically when the RAM RST and RESET are switched ON/OFF.
Check the CMOS RAM.
END
8. Printer interface doesn't function
8
Check the strobe signals.
Check M14 and M32.
Check the data signals.
Check M25, M10 and M32.
Check the connector and printer cable.
END